So Thor was moved from his quarantine tank to his full tank finally today. During my tests of his environment the substrate on the hot side was barely hitting 92° – 94°, and wouldn't you know it the minute I turn on his light it burnt out, so I rushed to Home Depot and bought a 120 watt halogen heat bulb thinking it should tie him over till the pet store opened in the morning. Boy was I off, his substrate hit 96° before I knew it, so I attached one of my dimmers and set it to half way which set his substrate at 91°. What size halogen should I be using in his tank so I can have a good heat gradient and lighting in there? As it stands now the light is poor being set to half power, plus it emits a high pitched humming that I can hear at this setting. His tank is 48"x24"x24" and I'm measuring temps digitally.

Thanks in advance
Ren